Approaches to evaluate spatial and temporal variability of deep marine sediment characteristics under the impact of dense water formation events

Type Article
Date 2020
Language English
Author(s) Durrieu De Madron Xavier1, Stabholz Marion1, Heimbuerger-Boavida Lars-Eric2, Aubert Dominique1, Kerherv Philippe1, Charriere Bruno1, Ludwig Wolfgang1
Affiliation(s) 1 : Univ Perpignan Via Domitia, CEFREM, CNRS, 52 Ave Paul Alduy, F-66860 Perpignan, France.
2 : Aix Marseille Univ, Mediterranean Inst Oceanog MIO UM 110, Univ Toulon, CNRS,IRD, F-13288 Marseille, France.
Source Mediterranean Marine Science (1108-393X) (Natl Centre Marine Research), 2020 , Vol. 21 , N. 3 , P. 527-544
DOI 10.12681/mms.22581
Keyword(s) Submarine canyon, organic matter, trace metals, Mediterranean, winter convection, bottom trawling
Abstract

Dense shelf water cascading and open-ocean convection frequently occur in the Gulf of Lions, Northwestern Mediterranean Sea. These intense dense water formation events are capable of supplying large amounts of particulate matter as well as remobilizing and dispersing local sediments and are therefore thought to leave an imprint on superficial deposits. Here, we compare the spatial variability of the superficial sediment composition (grain size, organic parameters, and metals) at different scales (from deciinetric to kilometric) on the continental slope and rise with the temporal variability linked to the occurrence of intense dense water formation events. The spatial and temporal variability of the geochemical composition of deep sediments was assessed using multivariate and geostatistical analyses. The results indicate that in the outer reaches of Cap de Creus Canyon, where both processes interact, no clear relation was found between the temporal variability of the superficial sediment and the deep-water formation events, and that the small-scale spatial variability of the sediment masks the temporal variability. Measurements across the southern slope indicate the presence of a somewhat distinct geochemical signature that likely results from the influence of recurrent intense, dense water formation events as well as unabating bottom trawling activity.

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Durrieu De Madron Xavier, Stabholz Marion, Heimbuerger-Boavida Lars-Eric, Aubert Dominique, Kerherv Philippe, Charriere Bruno, Ludwig Wolfgang (2020). Approaches to evaluate spatial and temporal variability of deep marine sediment characteristics under the impact of dense water formation events. Mediterranean Marine Science, 21(3), 527-544. Publisher's official version : https://doi.org/10.12681/mms.22581 , Open Access version : https://archimer.ifremer.fr/doc/00697/80875/